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Earnings Per Share - Computations of Earnings (Loss) per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income $ 192.0 $ 217.2 $ 372.9 $ 395.0
Basic earnings per common share $ 1.47 $ 1.57 $ 2.83 $ 2.85
Diluted earnings per common share $ 1.46 $ 1.55 $ 2.80 $ 2.81
Basic average shares outstanding 130.3 138.4 131.9 138.5
Stock-based awards 0.9 2.0 1.1 2.0
Diluted average shares outstanding 131.2 140.4 133.0 140.5
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share 1.6 0.4 1.0 0.3